F = Pause and Go to the next frame

d for stickman die
space for pause
s/l to save/load stamp
k stamp liblary

Ctrl + C, V, or X is for:

Copy = C
Paste = V
Cut = X

Shift + Click hold = make a line of a material
Ctrl + click Hold = make a square of a material
Ctrl + Shift + Hold = fill the empty space of a figure.

Ctrl + Z makes an undo

The undo is based on the last time you changed the game in some way by adding more material, erasing, or anything that would alter the current status of the game

Yes! Thank you, I was wondering if there was one.

CAPS LOCK
Prevent writing.
RIGHT ALT + RIGHT CTRL
Nothing... Hehehe
TAB
Switch between CIRCLE and SQUARE brushes.
SHIFT + [ or ]
allows you to change the pixel width of your brush...

gamerboy8864
RIGHT ALT + RIGHT CTRL doesn't work in official... only crackers mod.

Dont forget insert for replace mode.